Process for manufacturing potassium polyphosphate

Details Process for manufacturing potassium polyphosphate Process for manufacturing potassium polyphosphate

1977-11-29

1979-11-13

Gantz, Delbert E.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

71 34, C01B 1516, C01B 2526

Patent

active

041743768

ABSTRACT:
A method for manufacturing potassium polyphosphate from ammonium bisulfate, sulfuric acid, phosphate rock and water, wherein the phosphate rock decomposition is passed through a gypsum filter, muriated potash and/or potassium sulfate is added to the basic filtrate, potassium fluosilicate is filtered off to market or alternate process, muriated potash is again added and the combination heated to the polymerization point to drive off (vaporize) ammonium chloride, muriatic acid and water, whereby potassium polyphosphate is produced. Concentrated sulfuric acid is added to the vapor phase and the product is scrubbed with the ammonium bisulfate and sulfuric acid being returned to process input.

REFERENCES:
patent: 2716591 (1955-08-01), Thomsen
patent: 3600152 (1971-08-01), Drechsel
patent: 3635669 (1972-01-01), Rubin
patent: 3697246 (1972-10-01), Drechsel et al.
patent: 3803884 (1974-04-01), Thompson

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